At the Dane County Courthouse, a 2 week trial is set to begin today for a 32 year old man who allegedly ran down his toddler son, killing him. Jesus Castillo-Dimas also is accused of stabbing the boy's mother and her boyfriend....who both survived. The boy's mother had been holding him when struck. The incident happened in July of 2012 in Fitchburg. The first phase of the trial will determine guilt, while the 2nd phase focuses on whether Dimas suffers from mental illness.